They suck ass thats what they do. I used them 2 years ago and the first day of hunting i missed a deer thanks to that POS cup that doesnt hold the bullet. I was carrying my rifle, muzzle down and while walking on a rough trail, that piece of crap fell out of its cup holder and onto the trail. Luckily i had a powerbelt but i had to wait 4 more days to put it to use. That cup is supposed to squeeze the bullet and hold it in the cup and when u push it down the bore, its supposed to squeeze it and hold not go anywhere. HA! thats total BS! I figured for the price it would be a great deal, but as ususal, i got stuck in the rear by its poorly made base ring. If you hunt from a stand or blind it may work out, but if you do a lot of walking, dont use the sabor tooth.